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render: introduce bt.1886 transfer function

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This commit is contained in:
llyyr 2025-10-04 14:48:42 +05:30
parent d8fb7adcf0
commit 6e1c8748ff
10 changed files with 52 additions and 0 deletions
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11
render/vulkan/shaders/texture.frag
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@ -19,6 +19,7 @@ layout (constant_id = 0) const int TEXTURE_TRANSFORM = 0;
#define TEXTURE_TRANSFORM_SRGB 1
#define TEXTURE_TRANSFORM_ST2084_PQ 2
#define TEXTURE_TRANSFORM_GAMMA22 3
#define TEXTURE_TRANSFORM_BT1886 4
float srgb_channel_to_linear(float x) {
return mix(x / 12.92,
@ -45,6 +46,14 @@ vec3 pq_color_to_linear(vec3 color) {
return pow(num / denom, vec3(inv_m1));
}
vec3 bt1886_color_to_linear(vec3 color) {
float lb = pow(0.0001, 1.0 / 2.4);
float lw = pow(1.0, 1.0 / 2.4);
float a = pow(lw - lb, 2.4);
float b = lb / (lw - lb);
return a * pow(color + vec3(b), vec3(2.4));
}
void main() {
vec4 in_color = textureLod(tex, uv, 0);
@ -63,6 +72,8 @@ void main() {
rgb = pq_color_to_linear(rgb);
} else if (TEXTURE_TRANSFORM == TEXTURE_TRANSFORM_GAMMA22) {
rgb = pow(rgb, vec3(2.2));
} else if (TEXTURE_TRANSFORM == TEXTURE_TRANSFORM_BT1886) {
rgb = bt1886_color_to_linear(rgb);
}
rgb *= data.luminance_multiplier;